Shear



y 1952 F. L. MOGARY ETAL SHEAR 2 SHEETS-SHEET 1 Original Filed Oct. 3,1944 fialzcial. JZOG 9 Lkarleu EQ ZQGaI y 1952 F. L. MOGARY ETAL SHEAR 2SHEETS-SHEET 2 Original Filed Oct. 3, 1944 Patented July 29, 1952 SHEARFrancis L. McGary and Charles E. McGary, Hardinsburg, Ky.

Original application October 3, 1944, Serial No. 556,968, now Patent No.2,449,561, dated September 21, 1948. Divided and this application June22, 1948, Serial No. 34,386

Our invention relates to a shear for sheet metal and the like, and it isan object of the sam to provide a shear that shall have a simple, directand powerful action.

Another object is to provide an improved movable shear blade. p

Still another object is to provide improved means for guiding thesevered edges of the Work past the shear, in both a bench type shear andin a hand-held shear, whereby to guide such edges in a way to permitready and free turning of the shear or the Work to either side as incutting various shapes other than straightsided figures, withoutinterference of the cut edges with the shear blades or the other partsof the shear, or the hands of the user;

Referring now to the drawings, which are annexed hereto and made a partof this application, and in which similar reference characters indicatesimilar parts;

Fig. 1 is a. side elevation of the shear,

Fig. 2, a plan view of the same,

Fig. 3, a bottom plan of the same,

Fig. 4 an elevation showing the side opposite to that shown in Fig. 1,

Fig. 5 an elevation similar to Fig. 4 but with the shear open, and

Fig. 6, a front end elevation.

In the drawings reference characters 35 and 36 indicate handles such asmay be similar to those shown in our U. S. application Ser. No. 556,967,which issued on June 1, 1948 as Patent #2,442,424. These handles areconnected by any suitable means, here shown as consisting of parallellinks 31 and 38 pivoted to the handle 35 at 39 and to the handle 36 at40. The clos ing movement of the shear is limited by a lug 1 Claim. (01.*.244)

.2 ing the shear forward or pulling it backward, all without crowdingthe other fingers.

The handgrip portion 45 of the upper handle has its lower part marked ain Fig. 1, offset from the plane of movement of the handles quitesharply, and this partis recurved at its rear end so as to lieapproximately in said plane or a little to the left thereof (looking inthe direction of movement of the shear) and the upper part, marked 12 inFig. 1, starts from said plane, is then slightly offset toward the rightof the shear, and is then recurved so that its rear end, with the rearend portion of the grip, lies well to the left of said plane, the partsa and b being separated about 50% more widely than corresponding partsof the grip portion 42 so as to accommodate the rear joint of the thumband afford maximum opportunity to exert force in closing the shear.

A shear blade 46 is shown as being formed integrally with the lowerhandle 42. This blade, as best shown in Figs. 5 and 6, is relativelythick at its rear end and becomes gradually thinner toward its frontend, i. e., toward the front or cutting end of the shear. Its upper facewhich may be called the shearing face is inclined upwardly from itsouter edge toward the cutting edge and its under face which may becalled on the handle 35, positioned to strike the adjacent portion ofthe handle 36.

The handgrip portions of the handles are formed for convenientengagement by a hand of the user in such manner that he may apply forcemost effectively and with a minimum of fatigue. For this purpose thelower handgrip portion 42, in the position of use of the shear, isoffset laterally with respect to the plane of movement of the handlesand is slightly recurved, this part being shaped to receive all of thusers fingers except the index finger. The latter is provided for by afinger hole at 43, and it will be noted that the wall at 44 isrelatively wide on account of the offsetting of the remaining handgripportion, thus aiding in the provision of a wide part against which theindex finger may bear effectively and without discomfort in pushthat issharply inclined upward from the outer edge toward the cutting edge inabout the midlength of the blade, but toward the rear end is graduallytilted downward so as to leave the blade of substantial thickness towardthe rear end, as shown in Fig. 5. This under face is only slightlyconvex at its forward end, it lying nearly in an oblique plane to causethe one cut edge of the work to be slid freely underneath said face, andits inclination and convexity increasing toward the rear end of theblade as shown in Fig. 6, to provide greater strength toward the rearend of the blade. Both this blade and the cooperating blade 4'! at thefront end of the shear (Fig. 6) lie substantially in a plane inclined tothe horizontal at a low angle, approximately 15.

The shear blade 41 is pivotally connected to the blade 46 by means of astud 48 fixed to the forward part of the handle 36, and is held in placeby a nut 49 threaded on the stud, a washer 50 being interposed betweenthe nut and the adjacent face of the blade 41. Said blade 41 has arearwardly projecting arm pivoted to the handle 35 by means of a bolt5|, here shown as being of the type having a notched head for a. screwsteady and brac the blade in operation. The

blade is heavy at its rear and adjacent the pivot and at its outer side,as above stated, but tapers forwardly and laterally so that its cuttingedge is relatively thin in a vertical direction, as shown in Fig. 11.Thus the upper or casting-01f face of blade 41 is only slightly convexat its forward end and lies nearly in an oblique plane to cause theother out edge of the work to slide freely over it, the inclination andconvexity increasing toward the pivot to provide the necessary strengthin the blade. The cutting edge of blade 46 and its lower or cutting faceare curved upward from both ends toward the middle while the cuttingedge of the blade 41 is curved downward from both ends toward the middleof the blade, or oppositely to the coacting edge, as shown in Fig. 10.By reason of the conformation of these edges the blades tend to maintaina distance from the workexcept at the point of impact and close thereto.Because of this and also because of the shape of the blades and the factthat they lie in planes inclined to the plane of movement of the handlesand to the horizontal (or to a plane at right angles to the plane ofmovement of the handles), it becomes possible to turn the shear from itsdirect straight line of out either to the right or to the left and toany desired extent, so as to cut shapes of many varieties such as couldbe out only with great difficulty heretofore, if at all, due to the factthat the work was in the way of the shear blade, and especially so inattempting to turn the shear to cause the cut to veer to the left.

It will be understood that the shear is here shown as made for the useof a right-handed user, and that for left-handed persons the necessaryalterations to fit it for such use will be made therein.

It will be obvious to those skilled in the art that numerous changes maybe made in the devices herein disclosed, all without departing from thespirit of the invention; and therefore we do not limit ourselves to whatis shown in the drawings and described in the specification, but only asindicated in the appended claim.

Having thus fully described our invention, what we claim is:

A shear having a rigid handle carrying a lower blade, an upper bladepivoted to said lower blade, a second handle pivotally associated withthe rigid handle for operating said upper blade, said blades havingshear edges divergently curved from a point near said pivot to theirfree ends, the lower blade having a substantially flat upper worksupporting face inclined downward from its shear edge toward its outermargin and a casting-01f under face slightly convex transversely of theblade, said face being inclined downward laterally toward the shear edgeand from the free end of the blade toward the other end to provide anextensive thin area at the free end of the blade and along its shearedge; the other one of said blades having an oblique under faceapproximately in the same plane as the casting-ofl face of the coactingblade when the shear is closed and an upper casting-01f face slightlyconvexed transversely of the blade, said blade being curved downwardlaterally of the blade toward the cutting edge and downward toward thefree end of the same to provide an extensive thin area on said bladelying approximately in the same plane as the coacting portion of thecoacting blade when the shear is closed.

FRANCIS L. MCGARY. CHARLES E. McGARY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date D. 101,791 Rauh Nov. 3, 19361,092 Heinisch Feb. 27, 1839 579,085 Wesselmann Mar. 16, 1897 639,874Thuiller Dec. 26, 1899 968,219 Wheeler Aug. 23, 1910 1,779,889 PurcellOct. 28, 1930 1,987,375 Simonsen et al. Jan. 8, 1935 2,264,840 IsaccDec. 2, 1941 2,292,271 Heise Aug. 4, 1942 FOREIGN PATENTS Number CountryDate 122,552 Great Britain Jan. 30, 1919 749,064 France May 3, 1933

